25401620 has 48 divisors (see below), whose sum is σ = 55496448. Its totient is φ = 9759360.

The previous prime is 25401611. The next prime is 25401631. The reversal of 25401620 is 2610452.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25401592 and 25401601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57119 + ... + 57561.

It is an arithmetic number, because the mean of its divisors is an integer number (1156176).

Almost surely, 2^25401620 is an apocalyptic number.

25401620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25401620 is an abundant number, since it is smaller than the sum of its proper divisors (30094828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25401620 is a wasteful number, since it uses less digits than its factorization.

25401620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25401620 is about 5040.0019841266. The cubic root of 25401620 is about 293.9592551553.

Subtracting from 25401620 its sum of digits (20), we obtain a square (25401600 = 5040²).

The spelling of 25401620 in words is "twenty-five million, four hundred one thousand, six hundred twenty".